feat: update AWS service endpoints metadata

Author: aws-sdk-kotlin-ci

codegen/aws-sdk-codegen/src/main/resources/aws/sdk/kotlin/codegen/endpoints.json

@@ -3395,6 +3395,7 @@
       },
       "cassandra" : {
         "endpoints" : {
+          "af-south-1" : { },
           "ap-east-1" : { },
           "ap-northeast-1" : { },
           "ap-northeast-2" : { },